APA (7th ed.) Citation

Ekman, P., & Friesen, W. V. (1975). Unmasking the face: A guide to recognizing emotions from facial clues. Prentice-Hall.

Chicago Style (17th ed.) Citation

Ekman, Paul, and Wallace V. Friesen. Unmasking the Face: A Guide to Recognizing Emotions from Facial Clues. Englewood Cliffs, NJ: Prentice-Hall, 1975.

MLA (9th ed.) Citation

Ekman, Paul, and Wallace V. Friesen. Unmasking the Face: A Guide to Recognizing Emotions from Facial Clues. Prentice-Hall, 1975.